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Here you will find the latest articles written by our insulation specialists focusing on product developments, building regulations and technical guidance notes.

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Category Archives: Technical

In-built separating layer in Celotex FI5000

Celotex continues to innovate not only through improved website tools like the new and improved U-value Calculator but also through continuous development and improvement of the products we offer.

In the past 18 months Celotex has brought several innovative products to the market.  A perfect example of this is our full fill cavity wall board, Celotex CF5000, which allows designers to achieve the much desired 0.18 W/m2K in a 100mm cavity as standard

Within all Celotex product innovations the need to understand the motivations of the people installing the insulation is paramount. One often asked question from contractors and designers to the Celotex Technical Centre is why we need a separating layer on top of the insulation prior to laying screed. The need to protect the foil face of the insulation from the wet screed, stopping screed migration through the board joints and creating a vapour control layer is the answer. This practice is well established in the insulation industry and has its place when the motivation for a quick completion on site is not so great.

Floors…by Celotex has offered another approach.

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On October 1st 2015, Section 6 of the Scottish Building Regulations were updated to include higher targets for energy efficiency and lower target U-values to achieve across applications. In light of this, our Head of Technical, Rob Warren discusses:

  • Aim, objectives and changes for Section 6 2015
  • Importance of Thermal Comfort
  • 5 steps to Thermal Comfort including an example of compliance through SAP
  • Celotex Solutions and Specification Support




Celotex Insulation talks Thermal Comfort with Santa

rob Online(PSD)Celotex’ very own Head of Technical, Rob Warren takes to your screens again, this time providing an interesting link between thermal comfort in housing and Santa Claus. An unsurprising link, but one that works very well, as you will find out in the video! Plus a funny ‘outtake’ intro too.

Take a look, and let us know what you think.

Don’t forget to subscribe to our Youtube channel and check out our website


Celotex Insulating Scotland Roadshow may have ended but its impact on the Scottish construction industry will last long after the insulation specialist’s pink campervan arrives home at the company HQ in Suffolk.

On 28th September, the campervan branded in Celotex pink and carrying a team of insulation specialists headed to Scotland to spread the word of products and services that can assist compliance to new Scottish Building Regulations. Throughout the two-week campaign, Celotex delivered a series of technical clinics at venues across the beautiful Scottish landscape and visited customers along the way. Check out the journey below….

Celotex in Scotland

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What is a cavity wall?

The cavity wall as the name suggests consists of two masonry walls with separated by a clear cavity.  By design the wall resists wind driven rain soaked up by the outer leaf migrating onto the inner surfaces. The width of the cavity has gradually got wider as the years have gone by and in the 1970’s insulation was introduced into the cavity with it becoming compulsory in Building Regulations during the 1990’s.

As part of ‘Factors shaping and driving insulation choice for masonry cavity walls’ I explained how the following impact insulation choice.

  • Compliance to Part L1A 2013 and FEES as part of SAP.
  • Approved Document C part 2.
  • Full BBA Certification Read more »

Influencing factors shaping and driving insulation choice for full fill cavity wall

CF5000_0002 (FINAL)

Today sees the launch of Celotex CF5000, a brand new full fill cavity wall solution from Celotex, and so it seems right to look at the influencing factors that drive the insulation choice for this specific application.

Part L1A and FEES

Over the last ten years there have been a number of successive changes to Approved Document Part L1A. Part L1A is concerned with how much energy a new residential building uses and such has a direct impact on the fabric of the building and its ability to conserve energy.

The most recent changes in 2013 included a new metric called FEES. This focuses on improving the fabric of the building to reduce energy consumption or in layman’s terms how often you switch your heating on.  The introduction of FEES meant new homes built in England require a stronger fabric performance to comply with SAP.

SAP compliance is a requirement of Part L1A

So what is FEES?

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This post aims to cover what a vapour control layer is, why it’s important and when it’s applicable to roof and floor applications.

  • *Note: Since the creation of this post, Celotex GS5000 has been replaced with Celotex GD5000.

So a little while ago we featured an acronym blog, revealing the ins and outs of our industry acronyms. This time, we are talking about another vital construction component called a vapour control layer or a VCL.

At Celotex and within our bustling technical department, our advisors are regularly asked questions relating to the VCL. What is it? What does it do? Am I using it the right way? With this in mind, our technical advisors featured a VCL Technical Twitter Takeover, which is a monthly opportunity for Tweeters to ask our Celotex Technical Centre a question or query using the hashtag #AskCelotex, hosted a VCL special.

This seems like a good time to crack on with a few questions.

What is a vapour control layer (VCL)?

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Over the last few months we have continued our Technical Twitter Takeover’s, featuring monthly hour long sessions dedicated to different topics affected by insulation and what we do here at Celotex. Within the Celotex Technical Centre (CTC) our fantastic team of technical advisors get asked a range of different questions so it is great to take some of those questions and explain them through a short afternoon of Twitter activity. It is also a great opportunity for those watching from across the social media stratosphere with a project enquiry to send in a Tweet using #AskCelotex to our technical team member to provide assistance.

The Celotex Floor Technical Twitter Takeover

So, February’s TTT focused on the top of your house with a pitched roof application and the topic for March was at the other end, looking at floor applications. Here are some of the questions that Celotex are asked regularly about floor applications and insulation solutions.

Question 1 – What membranes should I use in a solid ground floor with Celotex insulation?
Celotex should be positioned above a dpm and below a minimum 500 gauge polythene seperating layer.

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